Vibratory device for dental molding machines



. 1923 2 Sheets-Sheet l A. C. SLOAN NVENTOR.

Original Filed May 29 VIBRATORY DEVICE FOR DENTALMOLDING MACHINES Pzlar/ March 25, 1930.

A. C. SLOAN March 25, 1930.

VIBRATORY DEVICE FOR DENTAL MOLDING MACHINES Original Filed May 29, 1923 2 Sheets-Sheet 2 l NV EN TOR.

Patented M. 2s, 1930 1,752,266

UNITED STATES PATENT OFFICE ALFRED C. SLOAN, F PHILADELPHIA, PENNSYLVANIA VIIBBATOBY DEVICE FOR DENTAL MOLDING MACHINES Application led May 29, 1923, Serial No. 642,352. Renewed August 2, 1929.

My invention relates to a novel vibratory disc to change the eccentric relation of the evice, primarily intended for use in connecaxis of said discs, means for holding said tion with dental molding machines, and has discs against turning and longitudinal moveparticular relation to a parent application ment in respect to each other. of such characteru filed by me June 24, 1920, Other novel details of construction and ad- 50 and given Serial N o. 391,414. l f vantages of my device are brought out in the The principal object of my invention refollowin description, when read in conjunc` sides in providing novel means for effecting tion wit the accompanying drawings, in the vibration of a vibratory device, said which Fig. 1 represents a vertical longitudimeans being adjustable to secure the desired nal sectional view illustrating one embodi- 65 degree of vlbration to the said vibratory dement of my invention; Fig. 2 represents a top vice. plan view of Fig. 1; Fig. 3 representsa verti- A further object of my invention is to procal transverse sectional view taken on the vide a vibratory device of this character line 3`3 of Fig. 1; Fig. 4 represents an enwhich consists of an adjustable balancing larged fragmentary sectional view partly in 60 means carried on the rotor shaft of an eleoelevation taken on the line 4-4 of Fig. 3, tric motor yieldingly supported from a. base showing an embodiment of balancing means member, means whereby said balancing for the rotor shaft of the motor; and Figs. 5, means may be adjusted to unbalance sai 6 and 7 represent sectional views showing the rotor shaft to effect the vibration of said several steps in the production of the positive 65 motor in the operation thereof. model of the mouth from which the denture,

A still further object of my invention coneither vulcanite or metallic, is produced. f

sists in yieldingly supporting a motor from Referring to the drawings, 1 designates a a stationary base member, the rotor shaft of base member or support on which the device said motor being provided with balancing is supported, the base member having secured means, said means consisting of a disc being to its upper face the upright posts 2, which fixed to and eccentrically supported on said are provided at the upper portions with shaft, a second disc carried by said first-mencollars 3 and 4, spaced apart and secured to tioned disc and eccentric in respect thereto, said posts. 5 and 6 designate coil-springs enmeans for adjusting said discs in relation to compassing said posts 2 with the outer ends 75 each other, and means adapted to hold said thereof respectively engaging against the indiscs as a unitary mass in the operation of the ner or opposed faces of the collars 3 and 4,

device. l while the inner ends of the said springs 5 and Furthermore, the device comprises broad- 6 engage the opposite faces of brackets 7 of a l a vibratory device adapted for use with framework 8, which carries the molding dbntal moldin machines, whjerein a motor is board or platform 9.

secured to and suspended from the under- Each of the brackets 7 has a vertical opensurface of a moldmg platform, said plating 10 therethrough, through which the reform being yieldingly supported from a base spectivc posts 2 extend, to allow for the vermember, the rotor shaft of said motor being tical yielding movement of the frame 8 and 85 provided with balancing means, which conplatform 9 with respect to the osts 2 secured sists of a disc secured to said rotor shaft, the to the base member 1. The p atform 9 ma axis of said disc being eccentric with respect be formed with depressed portions 11 and 11 to the axis of the rotor shaft a second disc to form trays for the molds or to contain a rotatably adjustable on said first-mentioned plastic material preparatory to using the ving 18. The

same. The platform 9 is preferably provided with the aproned portion 12 to cover the mechanism of the device.

To effect an even distribution of the vibration over the ent-ire platform, I preferably arrange the yielding means adjacent to the four corners of the platform as illustrated in Fig. 2 of the drawings.

To effect vibration of the platform 9, I provide a novel vibratory devlce carried on the under portion of the platform, this vibratory device consists of a motor 13 preferably electrically driven, which is suspended from and secured to the frame 8 at a location intermediate the four posts 2 on which the platform is yieldingly supported. The motor 13 is provided with a rotor shaft of the usual type and in this construction the rotor shaft is preferably supported on roller bearings (not shown) located in the ends of the motor housing. 14 designates as an entirety adjustable balancing means carried on the end of the rotor shaft, the said balancing means consisting of a disc 15 eccentrically mounted and secured to the rotor shaft. This disc on its peripheral face is grooved at 16 as shown in Figs. 3 and 4, the purpose of which will be described later on in the description. 17 designates a second disc havin an opening 18 therethrough, said opening eing located eccentric to the axis of said disc.

The assembly of the disc 17 to the disc 15 consists in positioning the disc 15 in the opendisc 17 is provided with setscrews 19 "which engage the bottom of the groove 17 to hold said disc 17 in a fixed relation to the disc 15. To effect adjustment of the discs in relation to each other, the setscrews 19 are screwed out of engagement with the disc 15, without entirely moving the end of the screws out of the groove, the ends of the screws preventing longitudinal displacement of the disc 17 with respect to the disc 15, at the same time allowing for the turning of the disc 17 on the disc 15 to alter the eccentricity of the axis of said discs in relation to each other, and to the axis of the rotor shaft on which the disc 15 is carried.

Referring to Figs. 5, 6 and 7 of the drawings, I have shown for urpose of clearness several steps in the met od of producing a positive model of the mouth. In Fig. 5 is shown the ordinary type of dental im ression mold 21 or negative mold taken rom the mouth. It is from this wax impression or mold that the positive model of plastic material is molded. (See Fig. 6 of the drawings wherein the plastic material to form the positive model is shown in the impression mold at 22). In Fig. 7 is shown the positive model of the mouth from which the denture is made, the same being removed from the wax 1mpression 21.

In the operation of my novel invention 1n connection with the above referred to metho to produce the positive model of the mouth or plastic material, the operator secures one or more of the mouth-trays containing the wax impression molds to the top of the platform 9 in the tray portion 11 thereof in any desirable manner, as for instance by wax as illustrated in Figs. 5 and 6 of the drawings. The tray portion 11a contains plaster of Paris which has been mixed to a proper consistency preparatory to using the same for molding purposes, the continuous vibration of the platform keeping the plastic material at the proper consistency. Continuing the vibration of the platform, the plastic material is applied in said negative mold, the uniform vibration thereof eliminating the air bubbles from the plastic material to effect a positive setting of the plastic material in the negative wax impression mold, the result being a more perfect positive model of the mouth than has heretofore been produced.

It will readily be seen from the description and reference to Figs. 3 and 4 of the drawings that the balancing means 14 on the rotor shaft of the motor may be adjusted to secure the proper degree of vibration for the yielding platform 9 from which the vibratory device is supported, the adjustment of the discs 15 and 17 in respect to each other effecting unbalance of the rotor shaft which is imparted to the motor, hence to the molding platform in the operation of the device.

Having thus described my invention, what I claim and desire to protect by Letters Patent of the United States is 1. A vibratory device of the character described, Which comprises a stationary base member, a motor having a rotor shaft yieldingly supported on said base member, means carried on the rotor shaft of said motor to 105 effect the unbalance of said shaft in the operation of the motor.

2. A vibratory device of the character described, which comprises a stationary base member, a motor having a rotor shaft yield- 110 ingly supported on said base member, balancing means carried on the rotor shaft of said motor, and means for adjusting said balancing means to eect the desired degree of unbalance of said rotor shaft.

3. A vibratory device for dental molding machines, which comprises in combination, a base member, posts secured to said base, a platform yieldingly supported on said oste and said platform, a motor suspended rom 120 and supported by the underneath portion of said platform, said motor being provided with a motor shaft, discs carried on said motor shaft, the axes of said discs bein eccentric with respect to each other and wit 125 the axis of the motor shaft, means for ad'usting the eccentric relationship of said iscs, and means for holding said discs as a unitary a rotor shaft ixedly carried by said molding platform, said platform and motor yieldingly supported on said base member, a disc secured to said rotor shaft and eccentric thereto, a second disc on said first-mentioned disc and eccentric thereto, means for adjusting the eccentricity of the axis of said discs with respect to each other, and means for holding said discs as a unitary mass.

`6. A vibratory device of the character deconsistingof a moldin board proper and a framework situated elow said molding board proper, said framework yieldingly supported on stationary osts, a motor having a rotor shaft lixed y carried by said framework, balancing means carried on the rotor shaft of said motor and means for adjusting said balancing means te effect the desired degreeof unbalance of said rotor shaft.

In testimony whereof, I have affixed my signature.

ALFRED (I SLOAN.

scribed which. comprises in combination, a

base member and a vibratory molding platform, a motor having a rotor shaft fixedly secured to said molding platform and yieldingly supported on said base member, said base member stationary with respect to said vibratory molding platform.

7. A vibratory device of the character de? scribed which comprises a stationary base member, a molding platform, a motor having a rotor shaft fixedlycarried by said molding platform, said platform and motor yieldingly supported on lsaid base member, a disc carried by and secured to said rotor shaft, a second disc, means for altering the eccentricity of the axis of said discs in relation to each other, and means for holding said discs as a unitary mass on said rotor shaft.y f

8. A vibratory device of the character described which comprises a molding platform rectangular shaped in plan, supporting means -for said molding platform, means for yieldingly connecting said molding platform adjacent its four corners with said supporting means, and means intermediate said supporting means for imparting a vibratory movement to said molding platform.

9.l A vibratory device of the character described which comprises a molding platform consisting of a rectangular shaped molding board proper and av framework situated below said molding board and in parallel re1a tion thereto, stationary posts arranged adjacent the four corners of said molding board and movably positioned in said framework, means for yieldingly supporting said framework on said posts, mediate said stationary posts carried by said framework to impart vibration to said molding board.

10.` A vibratory device `of the character described which comprises a molding platform vibratory means inter- 

